FreeBSD/Linux Kernel Cross Reference
sys/kern/bus_if.m
1 #-
2 # Copyright (c) 1998-2004 Doug Rabson
3 # All rights reserved.
4 #
5 # Redistribution and use in source and binary forms, with or without
6 # modification, are permitted provided that the following conditions
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8 # 1. Redistributions of source code must retain the above copyright
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10 # 2. Redistributions in binary form must reproduce the above copyright
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13 #
14 # THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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26 # $FreeBSD: releng/8.2/sys/kern/bus_if.m 215064 2010-11-09 22:18:20Z mav $
27 #
28
29 #include <sys/types.h>
30 #include <sys/systm.h>
31 #include <sys/bus.h>
32
33 /**
34 * @defgroup BUS bus - KObj methods for drivers of devices with children
35 * @brief A set of methods required device drivers that support
36 * child devices.
37 * @{
38 */
39 INTERFACE bus;
40
41 #
42 # Default implementations of some methods.
43 #
44 CODE {
45 static struct resource *
46 null_alloc_resource(device_t dev, device_t child,
47 int type, int *rid, u_long start, u_long end,
48 u_long count, u_int flags)
49 {
50 return (0);
51 }
52
53 static int
54 null_remap_intr(device_t bus, device_t dev, u_int irq)
55 {
56
57 if (dev != NULL)
58 return (BUS_REMAP_INTR(dev, NULL, irq));
59 return (ENXIO);
60 }
61
62 static device_t
63 null_add_child(device_t bus, int order, const char *name,
64 int unit)
65 {
66
67 panic("bus_add_child is not implemented");
68 }
69 };
70
71 /**
72 * @brief Print a description of a child device
73 *
74 * This is called from system code which prints out a description of a
75 * device. It should describe the attachment that the child has with
76 * the parent. For instance the TurboLaser bus prints which node the
77 * device is attached to. See bus_generic_print_child() for more
78 * information.
79 *
80 * @param _dev the device whose child is being printed
81 * @param _child the child device to describe
82 *
83 * @returns the number of characters output.
84 */
85 METHOD int print_child {
86 device_t _dev;
87 device_t _child;
88 } DEFAULT bus_generic_print_child;
89
90 /**
91 * @brief Print a notification about an unprobed child device.
92 *
93 * Called for each child device that did not succeed in probing for a
94 * driver.
95 *
96 * @param _dev the device whose child was being probed
97 * @param _child the child device which failed to probe
98 */
99 METHOD void probe_nomatch {
100 device_t _dev;
101 device_t _child;
102 };
103
104 /**
105 * @brief Read the value of a bus-specific attribute of a device
106 *
107 * This method, along with BUS_WRITE_IVAR() manages a bus-specific set
108 * of instance variables of a child device. The intention is that
109 * each different type of bus defines a set of appropriate instance
110 * variables (such as ports and irqs for ISA bus etc.)
111 *
112 * This information could be given to the child device as a struct but
113 * that makes it hard for a bus to add or remove variables without
114 * forcing an edit and recompile for all drivers which may not be
115 * possible for vendor supplied binary drivers.
116 *
117 * This method copies the value of an instance variable to the
118 * location specified by @p *_result.
119 *
120 * @param _dev the device whose child was being examined
121 * @param _child the child device whose instance variable is
122 * being read
123 * @param _index the instance variable to read
124 * @param _result a loction to recieve the instance variable
125 * value
126 *
127 * @retval 0 success
128 * @retval ENOENT no such instance variable is supported by @p
129 * _dev
130 */
131 METHOD int read_ivar {
132 device_t _dev;
133 device_t _child;
134 int _index;
135 uintptr_t *_result;
136 };
137
138 /**
139 * @brief Write the value of a bus-specific attribute of a device
140 *
141 * This method sets the value of an instance variable to @p _value.
142 *
143 * @param _dev the device whose child was being updated
144 * @param _child the child device whose instance variable is
145 * being written
146 * @param _index the instance variable to write
147 * @param _value the value to write to that instance variable
148 *
149 * @retval 0 success
150 * @retval ENOENT no such instance variable is supported by @p
151 * _dev
152 * @retval EINVAL the instance variable was recognised but
153 * contains a read-only value
154 */
155 METHOD int write_ivar {
156 device_t _dev;
157 device_t _child;
158 int _indx;
159 uintptr_t _value;
160 };
161
162 /**
163 * @brief Notify a bus that a child was detached
164 *
165 * Called after the child's DEVICE_DETACH() method to allow the parent
166 * to reclaim any resources allocated on behalf of the child.
167 *
168 * @param _dev the device whose child changed state
169 * @param _child the child device which changed state
170 */
171 METHOD void child_detached {
172 device_t _dev;
173 device_t _child;
174 };
175
176 /**
177 * @brief Notify a bus that a new driver was added
178 *
179 * Called when a new driver is added to the devclass which owns this
180 * bus. The generic implementation of this method attempts to probe and
181 * attach any un-matched children of the bus.
182 *
183 * @param _dev the device whose devclass had a new driver
184 * added to it
185 * @param _driver the new driver which was added
186 */
187 METHOD void driver_added {
188 device_t _dev;
189 driver_t *_driver;
190 } DEFAULT bus_generic_driver_added;
191
192 /**
193 * @brief Create a new child device
194 *
195 * For busses which use use drivers supporting DEVICE_IDENTIFY() to
196 * enumerate their devices, this method is used to create new
197 * device instances. The new device will be added after the last
198 * existing child with the same order.
199 *
200 * @param _dev the bus device which will be the parent of the
201 * new child device
202 * @param _order a value which is used to partially sort the
203 * children of @p _dev - devices created using
204 * lower values of @p _order appear first in @p
205 * _dev's list of children
206 * @param _name devclass name for new device or @c NULL if not
207 * specified
208 * @param _unit unit number for new device or @c -1 if not
209 * specified
210 */
211 METHOD device_t add_child {
212 device_t _dev;
213 u_int _order;
214 const char *_name;
215 int _unit;
216 } DEFAULT null_add_child;
217
218 /**
219 * @brief Allocate a system resource
220 *
221 * This method is called by child devices of a bus to allocate resources.
222 * The types are defined in <machine/resource.h>; the meaning of the
223 * resource-ID field varies from bus to bus (but @p *rid == 0 is always
224 * valid if the resource type is). If a resource was allocated and the
225 * caller did not use the RF_ACTIVE to specify that it should be
226 * activated immediately, the caller is responsible for calling
227 * BUS_ACTIVATE_RESOURCE() when it actually uses the resource.
228 *
229 * @param _dev the parent device of @p _child
230 * @param _child the device which is requesting an allocation
231 * @param _type the type of resource to allocate
232 * @param _rid a pointer to the resource identifier
233 * @param _start hint at the start of the resource range - pass
234 * @c 0UL for any start address
235 * @param _end hint at the end of the resource range - pass
236 * @c ~0UL for any end address
237 * @param _count hint at the size of range required - pass @c 1
238 * for any size
239 * @param _flags any extra flags to control the resource
240 * allocation - see @c RF_XXX flags in
241 * <sys/rman.h> for details
242 *
243 * @returns the resource which was allocated or @c NULL if no
244 * resource could be allocated
245 */
246 METHOD struct resource * alloc_resource {
247 device_t _dev;
248 device_t _child;
249 int _type;
250 int *_rid;
251 u_long _start;
252 u_long _end;
253 u_long _count;
254 u_int _flags;
255 } DEFAULT null_alloc_resource;
256
257 /**
258 * @brief Activate a resource
259 *
260 * Activate a resource previously allocated with
261 * BUS_ALLOC_RESOURCE(). This may for instance map a memory region
262 * into the kernel's virtual address space.
263 *
264 * @param _dev the parent device of @p _child
265 * @param _child the device which allocated the resource
266 * @param _type the type of resource
267 * @param _rid the resource identifier
268 * @param _r the resource to activate
269 */
270 METHOD int activate_resource {
271 device_t _dev;
272 device_t _child;
273 int _type;
274 int _rid;
275 struct resource *_r;
276 };
277
278 /**
279 * @brief Deactivate a resource
280 *
281 * Deactivate a resource previously allocated with
282 * BUS_ALLOC_RESOURCE(). This may for instance unmap a memory region
283 * from the kernel's virtual address space.
284 *
285 * @param _dev the parent device of @p _child
286 * @param _child the device which allocated the resource
287 * @param _type the type of resource
288 * @param _rid the resource identifier
289 * @param _r the resource to deactivate
290 */
291 METHOD int deactivate_resource {
292 device_t _dev;
293 device_t _child;
294 int _type;
295 int _rid;
296 struct resource *_r;
297 };
298
299 /**
300 * @brief Release a resource
301 *
302 * Free a resource allocated by the BUS_ALLOC_RESOURCE. The @p _rid
303 * value must be the same as the one returned by BUS_ALLOC_RESOURCE()
304 * (which is not necessarily the same as the one the client passed).
305 *
306 * @param _dev the parent device of @p _child
307 * @param _child the device which allocated the resource
308 * @param _type the type of resource
309 * @param _rid the resource identifier
310 * @param _r the resource to release
311 */
312 METHOD int release_resource {
313 device_t _dev;
314 device_t _child;
315 int _type;
316 int _rid;
317 struct resource *_res;
318 };
319
320 /**
321 * @brief Install an interrupt handler
322 *
323 * This method is used to associate an interrupt handler function with
324 * an irq resource. When the interrupt triggers, the function @p _intr
325 * will be called with the value of @p _arg as its single
326 * argument. The value returned in @p *_cookiep is used to cancel the
327 * interrupt handler - the caller should save this value to use in a
328 * future call to BUS_TEARDOWN_INTR().
329 *
330 * @param _dev the parent device of @p _child
331 * @param _child the device which allocated the resource
332 * @param _irq the resource representing the interrupt
333 * @param _flags a set of bits from enum intr_type specifying
334 * the class of interrupt
335 * @param _intr the function to call when the interrupt
336 * triggers
337 * @param _arg a value to use as the single argument in calls
338 * to @p _intr
339 * @param _cookiep a pointer to a location to recieve a cookie
340 * value that may be used to remove the interrupt
341 * handler
342 */
343 METHOD int setup_intr {
344 device_t _dev;
345 device_t _child;
346 struct resource *_irq;
347 int _flags;
348 driver_filter_t *_filter;
349 driver_intr_t *_intr;
350 void *_arg;
351 void **_cookiep;
352 };
353
354 /**
355 * @brief Uninstall an interrupt handler
356 *
357 * This method is used to disassociate an interrupt handler function
358 * with an irq resource. The value of @p _cookie must be the value
359 * returned from a previous call to BUS_SETUP_INTR().
360 *
361 * @param _dev the parent device of @p _child
362 * @param _child the device which allocated the resource
363 * @param _irq the resource representing the interrupt
364 * @param _cookie the cookie value returned when the interrupt
365 * was originally registered
366 */
367 METHOD int teardown_intr {
368 device_t _dev;
369 device_t _child;
370 struct resource *_irq;
371 void *_cookie;
372 };
373
374 /**
375 * @brief Define a resource which can be allocated with
376 * BUS_ALLOC_RESOURCE().
377 *
378 * This method is used by some busses (typically ISA) to allow a
379 * driver to describe a resource range that it would like to
380 * allocate. The resource defined by @p _type and @p _rid is defined
381 * to start at @p _start and to include @p _count indices in its
382 * range.
383 *
384 * @param _dev the parent device of @p _child
385 * @param _child the device which owns the resource
386 * @param _type the type of resource
387 * @param _rid the resource identifier
388 * @param _start the start of the resource range
389 * @param _count the size of the resource range
390 */
391 METHOD int set_resource {
392 device_t _dev;
393 device_t _child;
394 int _type;
395 int _rid;
396 u_long _start;
397 u_long _count;
398 };
399
400 /**
401 * @brief Describe a resource
402 *
403 * This method allows a driver to examine the range used for a given
404 * resource without actually allocating it.
405 *
406 * @param _dev the parent device of @p _child
407 * @param _child the device which owns the resource
408 * @param _type the type of resource
409 * @param _rid the resource identifier
410 * @param _start the address of a location to recieve the start
411 * index of the resource range
412 * @param _count the address of a location to recieve the size
413 * of the resource range
414 */
415 METHOD int get_resource {
416 device_t _dev;
417 device_t _child;
418 int _type;
419 int _rid;
420 u_long *_startp;
421 u_long *_countp;
422 };
423
424 /**
425 * @brief Delete a resource.
426 *
427 * Use this to delete a resource (possibly one previously added with
428 * BUS_SET_RESOURCE()).
429 *
430 * @param _dev the parent device of @p _child
431 * @param _child the device which owns the resource
432 * @param _type the type of resource
433 * @param _rid the resource identifier
434 */
435 METHOD void delete_resource {
436 device_t _dev;
437 device_t _child;
438 int _type;
439 int _rid;
440 };
441
442 /**
443 * @brief Return a struct resource_list.
444 *
445 * Used by drivers which use bus_generic_rl_alloc_resource() etc. to
446 * implement their resource handling. It should return the resource
447 * list of the given child device.
448 *
449 * @param _dev the parent device of @p _child
450 * @param _child the device which owns the resource list
451 */
452 METHOD struct resource_list * get_resource_list {
453 device_t _dev;
454 device_t _child;
455 } DEFAULT bus_generic_get_resource_list;
456
457 /**
458 * @brief Is the hardware described by @p _child still attached to the
459 * system?
460 *
461 * This method should return 0 if the device is not present. It
462 * should return -1 if it is present. Any errors in determining
463 * should be returned as a normal errno value. Client drivers are to
464 * assume that the device is present, even if there is an error
465 * determining if it is there. Busses are to try to avoid returning
466 * errors, but newcard will return an error if the device fails to
467 * implement this method.
468 *
469 * @param _dev the parent device of @p _child
470 * @param _child the device which is being examined
471 */
472 METHOD int child_present {
473 device_t _dev;
474 device_t _child;
475 } DEFAULT bus_generic_child_present;
476
477 /**
478 * @brief Returns the pnp info for this device.
479 *
480 * Return it as a string. If the string is insufficient for the
481 * storage, then return EOVERFLOW.
482 *
483 * @param _dev the parent device of @p _child
484 * @param _child the device which is being examined
485 * @param _buf the address of a buffer to receive the pnp
486 * string
487 * @param _buflen the size of the buffer pointed to by @p _buf
488 */
489 METHOD int child_pnpinfo_str {
490 device_t _dev;
491 device_t _child;
492 char *_buf;
493 size_t _buflen;
494 };
495
496 /**
497 * @brief Returns the location for this device.
498 *
499 * Return it as a string. If the string is insufficient for the
500 * storage, then return EOVERFLOW.
501 *
502 * @param _dev the parent device of @p _child
503 * @param _child the device which is being examined
504 * @param _buf the address of a buffer to receive the location
505 * string
506 * @param _buflen the size of the buffer pointed to by @p _buf
507 */
508 METHOD int child_location_str {
509 device_t _dev;
510 device_t _child;
511 char *_buf;
512 size_t _buflen;
513 };
514
515 /**
516 * @brief Allow drivers to request that an interrupt be bound to a specific
517 * CPU.
518 *
519 * @param _dev the parent device of @p _child
520 * @param _child the device which allocated the resource
521 * @param _irq the resource representing the interrupt
522 * @param _cpu the CPU to bind the interrupt to
523 */
524 METHOD int bind_intr {
525 device_t _dev;
526 device_t _child;
527 struct resource *_irq;
528 int _cpu;
529 } DEFAULT bus_generic_bind_intr;
530
531 /**
532 * @brief Allow (bus) drivers to specify the trigger mode and polarity
533 * of the specified interrupt.
534 *
535 * @param _dev the bus device
536 * @param _irq the interrupt number to modify
537 * @param _trig the trigger mode required
538 * @param _pol the interrupt polarity required
539 */
540 METHOD int config_intr {
541 device_t _dev;
542 int _irq;
543 enum intr_trigger _trig;
544 enum intr_polarity _pol;
545 } DEFAULT bus_generic_config_intr;
546
547 /**
548 * @brief Allow drivers to associate a description with an active
549 * interrupt handler.
550 *
551 * @param _dev the parent device of @p _child
552 * @param _child the device which allocated the resource
553 * @param _irq the resource representing the interrupt
554 * @param _cookie the cookie value returned when the interrupt
555 * was originally registered
556 * @param _descr the description to associate with the interrupt
557 */
558 METHOD int describe_intr {
559 device_t _dev;
560 device_t _child;
561 struct resource *_irq;
562 void *_cookie;
563 const char *_descr;
564 } DEFAULT bus_generic_describe_intr;
565
566 /**
567 * @brief Notify a (bus) driver about a child that the hints mechanism
568 * believes it has discovered.
569 *
570 * The bus is responsible for then adding the child in the right order
571 * and discovering other things about the child. The bus driver is
572 * free to ignore this hint, to do special things, etc. It is all up
573 * to the bus driver to interpret.
574 *
575 * This method is only called in response to the parent bus asking for
576 * hinted devices to be enumerated.
577 *
578 * @param _dev the bus device
579 * @param _dname the name of the device w/o unit numbers
580 * @param _dunit the unit number of the device
581 */
582 METHOD void hinted_child {
583 device_t _dev;
584 const char *_dname;
585 int _dunit;
586 };
587
588 /**
589 * @brief Returns bus_dma_tag_t for use w/ devices on the bus.
590 *
591 * @param _dev the parent device of @p _child
592 * @param _child the device to which the tag will belong
593 */
594 METHOD bus_dma_tag_t get_dma_tag {
595 device_t _dev;
596 device_t _child;
597 } DEFAULT bus_generic_get_dma_tag;
598
599 /**
600 * @brief Allow the bus to determine the unit number of a device.
601 *
602 * @param _dev the parent device of @p _child
603 * @param _child the device whose unit is to be wired
604 * @param _name the name of the device's new devclass
605 * @param _unitp a pointer to the device's new unit value
606 */
607 METHOD void hint_device_unit {
608 device_t _dev;
609 device_t _child;
610 const char *_name;
611 int *_unitp;
612 };
613
614 /**
615 * @brief Notify a bus that the bus pass level has been changed
616 *
617 * @param _dev the bus device
618 */
619 METHOD void new_pass {
620 device_t _dev;
621 } DEFAULT bus_generic_new_pass;
622
623 /**
624 * @brief Notify a bus that specified child's IRQ should be remapped.
625 *
626 * @param _dev the bus device
627 * @param _child the child device
628 * @param _irq the irq number
629 */
630 METHOD int remap_intr {
631 device_t _dev;
632 device_t _child;
633 u_int _irq;
634 } DEFAULT null_remap_intr;
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